Abstract-Hydrodynamic simulations of terahertz oscillation in double-layer graphene

Wei Feng

http://iopscience.iop.org/article/10.1088/1674-4926/39/12/122005/pdf

We have theoretically studied current self-oscillations in double-layer graphene n+nn+ diodes driven by dc bias with the help of a time-dependent hydrodynamic model. The current self-oscillation results from resonant tunneling in the double-layer graphene structure. A detailed investigation of the dependence of the current self-oscillations on the applied bias has been carried out. The frequencies of current self-oscillations are in the terahertz (THz) region. The double-layer graphene n+nn+ device studied here may be presented as a THz source at room temperature.

Abstract-Double-graphene-layer terahertz laser: concept, characteristics, and comparison

My note: The entire article can be read for free online, at the posted link.

Victor Ryzhii, Alexander A. Dubinov, Taiichi Otsuji, Vladimir Ya. Aleshkin, Maxim Ryzhii, and Michael Shur  »View Author Affiliations
http://www.opticsinfobase.org/oe/fulltext.cfm?uri=oe-21-25-31567&id=276087

We propose and analyze the concept of injection terahertz (THz) lasers based on double-graphene-layer (double-GL) structures utilizing the resonant radiative transitions between GLs. We calculate main characteristics of such double-GL lasers and compare them with the characteristics of the GL lasers with intra-GL interband transitions. We demonstrate that the double-GL THz lasers under consideration can operate in a wide range of THz frequencies and might exhibit advantages associated with the reduced Drude absorption, weaker temperature dependence, voltage tuning of the spectrum, and favorable injection conditions.